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            <a href="/2021/01/09/sk-buff/" class="post-title-link" itemprop="url">sk_buff简介</a>
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              <time title="创建时间：2021-01-09 16:33:03 / 修改时间：22:19:18" itemprop="dateCreated datePublished" datetime="2021-01-09T16:33:03+08:00">2021-01-09</time>
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          <h1 id="sk-buff介绍"><a href="#sk-buff介绍" class="headerlink" title="sk_buff介绍"></a>sk_buff介绍</h1><h6 id="sk-buff"><a href="#sk-buff" class="headerlink" title="sk_buff"></a>sk_buff</h6><p><strong>fragment</strong> - frag_list, and frags array</p>
<p><strong>clone</strong> - struct sk_buff *<strong>skb_clone</strong>(struct sk_buff *skb, gfp_t gfp_mask)</p>
<ol>
<li>skb-&gt;cloned is set to 1 in both the clone and the original buffer</li>
<li>skb-&gt;users is set to in the clone, so that the first attempt to remove it succeeds</li>
<li>the number of reference(dataref) to the buffer containing  the data is incremented, since now there is one more sk_buff data structure pointing to it.</li>
<li><strong>When a buffer is cloned, the content of the data block cannot be modified!</strong></li>
</ol>
<p><strong>pskb-copy</strong> - user can modify only the contents of the data in the area between skb-&gt;start and skb-end</p>
<p><strong>skb-copy</strong> - user can modify the content of the fragment data blocks too.</p>
<h6 id="sk-buff-queue"><a href="#sk-buff-queue" class="headerlink" title="sk_buff queue"></a>sk_buff queue</h6><p>all functions must be atomically, that is, they must grab the spin lock provided by the sk_buff_head structure for the queue. Otherwiese, they could be interrupted by asynchronous events that enqueue or dequeue elements from the queues, such as functions invoked by expired timers, which would lead to race conditions.</p>
<h6 id="mem-cache"><a href="#mem-cache" class="headerlink" title="mem_cache_"></a>mem_cache_</h6><h6 id="fclone-2"><a href="#fclone-2" class="headerlink" title="fclone:2"></a>fclone:2</h6><table>
<thead>
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<th>fclone</th>
<th>描述</th>
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<tbody><tr>
<td>SKB_FCLONE_UNAVAILABLE</td>
<td>/* skb has no fclone (from head_cache) */</td>
</tr>
<tr>
<td>SKB_FCLONE_ORIG</td>
<td>/* orig skb (from fclone_cache) */</td>
</tr>
<tr>
<td>SKB_FCLONE_CLONE</td>
<td>/* companion fclone skb (from fclone_cache) */</td>
</tr>
</tbody></table>
<h6 id="skb-init"><a href="#skb-init" class="headerlink" title="skb_init"></a>skb_init</h6><p>这一对SKB是父子关系，指向同一个数据缓存区，引用计数值为0，1或2，用来表示这一对SKB中有几个已被使用。</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">sk_buff_fclones</span> &#123;</span></span><br><span class="line">	<span class="class"><span class="keyword">struct</span> <span class="title">sk_buff</span>	<span class="title">skb1</span>;</span></span><br><span class="line">	<span class="class"><span class="keyword">struct</span> <span class="title">sk_buff</span>	<span class="title">skb2</span>;</span></span><br><span class="line">	<span class="keyword">refcount_t</span>	fclone_ref; </span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> __init <span class="title">skb_init</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	skbuff_head_cache = kmem_cache_create_usercopy(<span class="string">&quot;skbuff_head_cache&quot;</span>,</span><br><span class="line">					      <span class="keyword">sizeof</span>(struct sk_buff),</span><br><span class="line">					      <span class="number">0</span>,</span><br><span class="line">					      SLAB_HWCACHE_ALIGN|SLAB_PANIC,</span><br><span class="line">					      offsetof(struct sk_buff, cb),</span><br><span class="line">					      sizeof_field(struct sk_buff, cb),</span><br><span class="line">					      <span class="literal">NULL</span>);</span><br><span class="line">	skbuff_fclone_cache = kmem_cache_create(<span class="string">&quot;skbuff_fclone_cache&quot;</span>,</span><br><span class="line">						<span class="keyword">sizeof</span>(struct sk_buff_fclones),</span><br><span class="line">						<span class="number">0</span>,</span><br><span class="line">						SLAB_HWCACHE_ALIGN|SLAB_PANIC,</span><br><span class="line">						<span class="literal">NULL</span>);</span><br><span class="line">	skb_extensions_init();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

      
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          <h1 id="linux内核网络调优参数说明"><a href="#linux内核网络调优参数说明" class="headerlink" title="linux内核网络调优参数说明"></a>linux内核网络调优参数说明</h1><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">uint64_t</span> received_buf_size = <span class="number">10</span>X*<span class="number">1024</span>X*<span class="number">1024</span>;</span><br><span class="line">setsockopt(socket_fd, SOL_SOCKET, SO_RCVBUFF, &amp;received_buf_size, <span class="keyword">sizeof</span>(received_buf_size));</span><br><span class="line"><span class="keyword">int</span> val;</span><br><span class="line"><span class="keyword">socklen_t</span> len;</span><br><span class="line">getsockopt(socket_fd, SOL_SOCKET, SO_RCVBUFF, &amp;val, &amp;len);</span><br><span class="line"><span class="keyword">default</span> - /proc/sys/net/core/rmem_default  <span class="number">212992</span> = <span class="number">208</span>K</span><br><span class="line">Output - <span class="number">425984</span> = <span class="number">416</span>K</span><br></pre></td></tr></table></figure>
<p>参考文章</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">https:&#x2F;&#x2F;blog.csdn.net&#x2F;liufei191010&#x2F;article&#x2F;details&#x2F;82767357</span><br><span class="line">https:&#x2F;&#x2F;blog.csdn.net&#x2F;linxi7&#x2F;article&#x2F;details&#x2F;109046902</span><br></pre></td></tr></table></figure>
<p>使用 /etc/sysctl.conf 在系统启动时将参数配置成您所设置的值:</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">net.core.rmem_default = 256960</span><br><span class="line">net.core.rmem_max = 256960</span><br><span class="line">net.core.wmem_default = 256960</span><br><span class="line">net.core.wmem_max = 256960</span><br><span class="line">net.ipv4.tcp_timestamps = 0</span><br><span class="line">net.ipv4.tcp_sack =1</span><br><span class="line">net.ipv4.tcp_window_scaling = 1</span><br></pre></td></tr></table></figure>



      
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            <a href="/2021/01/02/%E7%BC%96%E8%AF%91linux%E5%86%85%E6%A0%B8/" class="post-title-link" itemprop="url">编译Linux内核</a>
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          <h6 id="下载内核源码"><a href="#下载内核源码" class="headerlink" title="下载内核源码"></a>下载内核源码</h6><p><a target="_blank" rel="noopener" href="https://www.kernel.org/">https://www.kernel.org/</a></p>
<h6 id="准备工作"><a href="#准备工作" class="headerlink" title="准备工作"></a>准备工作</h6><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">sudo apt-get install libncurses5-dev openssl libssl-dev </span><br><span class="line">sudo apt-get install build-essential</span><br><span class="line">sudo apt-get install pkg-config</span><br><span class="line">sudo apt-get install libc6-dev</span><br><span class="line">sudo apt-get install bison</span><br><span class="line">sudo apt-get install flex</span><br><span class="line">sudo apt-get install libelf-dev</span><br><span class="line">sudo apt-get install zlibc minizip</span><br><span class="line">sudo apt-get install libidn11-dev libidn11</span><br></pre></td></tr></table></figure>
<h6 id="编译内核"><a href="#编译内核" class="headerlink" title="编译内核"></a>编译内核</h6><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">make menuconfig</span><br><span class="line">sudo make</span><br><span class="line"><span class="meta">#</span><span class="bash">du -sh <span class="comment">#查看编译后的目录的大小</span></span></span><br><span class="line">sudo make modules_install #安装内核模块</span><br><span class="line">sudo make install #安装内核</span><br><span class="line">uname -a #查看当前系统内核</span><br></pre></td></tr></table></figure>
<p>initrd.img即boot loader initialized RAM disk，就是由 boot loader 初始化的内存盘</p>
<h6 id="修改grub"><a href="#修改grub" class="headerlink" title="修改grub"></a>修改grub</h6><p>启动的时候按住shift键，就可以看到grub界面了</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">sudo vi /etc/default/grub</span><br><span class="line">sudo update-grub</span><br></pre></td></tr></table></figure>


<h6 id="参考文章"><a href="#参考文章" class="headerlink" title="参考文章"></a>参考文章</h6><ol>
<li><p><a target="_blank" rel="noopener" href="https://www.cnblogs.com/linkchen/p/13926846.html">https://www.cnblogs.com/linkchen/p/13926846.html</a></p>
</li>
<li><p>修改ubuntu的grub后重启直接进入memtest解决办法</p>
<p><a target="_blank" rel="noopener" href="https://blog.csdn.net/zhangjs0322/article/details/8686775">https://blog.csdn.net/zhangjs0322/article/details/8686775</a></p>
</li>
<li><p>ubuntu 16.04 LTS 内核源码下载编译流程</p>
<p><a target="_blank" rel="noopener" href="https://blog.csdn.net/smilestone_322/article/details/78163994?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromBaidu-1.not_use_machine_learn_pai&amp;depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromBaidu-1.not_use_machine_learn_pai">https://blog.csdn.net/smilestone_322/article/details/78163994?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromBaidu-1.not_use_machine_learn_pai&amp;depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromBaidu-1.not_use_machine_learn_pai</a></p>
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